Drilling-machine.



F. MAROVITCH.

DR ILLING MACHINE.

APPLICATION FILED DEC- 13. I915.

217,617. latexited Feb. 27, 1917.

' 2 SHEETS-SHEET 1.

i i I a I INVENTOH WITNESSES ATTORNEY F. IVIAROVIICH.

DRILLING MACHINE. APPLICATION man 050.13. 1915.

1,217,617. Patented Feb.27,1917. z smiflswsuinz.

if a FRANK MAROVITCH, OF NELSON, BRITISI-1I GOLUMBIA, CANADA.

DRILLING-MACHIN Specification of Letters Patent. i Patented Feb. 27 1917 Application filed December 13, 1915. Serial No. 66,663.

To all whom it may concern:

Be it known that I, FRANK Mnnovrrcn, a subject of the Emperor of Austria-Hungary, residing at Nelson, in the Province of British Columbia and Dominion of Canada, have invented certain new and useful Improvements in Drilling-Machines, of which the following is a specification.

An object of my invention is to provide a mechanical hand operated tool which can be used in the place of the usual pneumatic tool for boring or drilling in rocks, for heading over rivets,and in other connections of alike nature.

A further object is to so construct'the parts that the machine may be made of a size to be readily handled and wil' at the same time give a' sharp and severe Liow as well as a maximum number of such blows for-the manual efforts required.

A still further object is to construct the parts in a manner that when the machine is being used for rock drilling, a blast is being directed down through the drill by the normal working of the machine to blow the dust and cuttings from beneath the drill, and that when the machine is used to head over rivets the air compressing means may be released.

lVith these and other objects in view, which will-be later set forth, my invention consists in certain novel features of construction and combinations of parts which will be described in connection with the accompanying drawings and pointed out in- The machine comprises a casing 1 which has a cylinder 2 secured in an opening 3 formed in the lower part thereof and this casing 1 has the bearings 4i and 5 provided at spaced apart points at one side thereof.

A driving gear (3 has a stub shaft 7 formed as a part thereof and this stub shaft 7 is mounted in the bearing 4, a pinion 8 being mounted by a stub shaft 9 in the bearing 5 in a relation to mesh with the gear wheel (5. An operating handle *10 is secured on the outer end of the stub shaft 7 by a set screw 11 and "as this handle 10 is manually m0ved,'the driving gear 6 will be caused to turn and through meshing with the pinion S will cause the stub shaft 9 to be revolved.

' The stub shaft is held in the bearing 5" the lower end, and this shoulder has the bore thereof formed as Ia bearing to receive the hammer block 17 which is mounted to have endwise sliding movement. The lower end of the cylinder 2 is provided with internal screw threads and a bushing 1S is mounted in the screw threaded end and is formed in its bearing portion to receive theshank end of a rock drill 19, or othertool tobe operated by the machine. instance, the drill isshown as having an octagonal-shaped shank 20 and it will, of course, be understood that the bearing socket 21 of the bushing 18 will be made octagonal and of a slightly greater diameter than the cross dimension of the shank 20 so that this shank may have relatively free sliding movement within the bushing. The hammer block 17 is provided with a shoulder 22 around the lower end thereof which prevents too great movement of the same in an upward direction through the bearing of the shoulder 16 and as the shank 20 of the tool is fitted through the bushing, this shank bears at its upper end against the lower end of the hammer block and when the cutting end 23'of the drill is in bearing engagement against the r'ock, the hammer block 17 is-held with its upper end' projecting into the cylinderabovethe shoulder .16 and With theportion 22 thereof in bearing engage- ,ment With the lower side of the shoulder.

In the present A piston 2% is mounted in the upper end of the cylinder 2 at a point adjacent the connection of the same With the casing 1 .inda connecting rod-25; is connected with the piston 24 by the wrist pin 26 and has its free end mounted on the crankpin 14 of the eccentric disk 13 so that as the handle is turned and movement is transmitted through the gear 6 to the pinion 8 to cause turning of the eccentric wheel 13, the piston 24 will be reciprocated in the chamber of the cyhnder 2 provided about the mounting of the hammer block 17.

The piston 24 is notched and cut away at its lower end to form the recess 27 between the body of the piston and the dentil 28, and a hammer 29 has the upper end thereof cut 'away and notched to provide the recess 30 and a dentil 31 similar to the formation on the lower end of the piston 24. This hammer 29 is made of a diameter to fit the cylinder 2 and by fitting the dentil 31 of the hammer into the recess 27 of the piston and consequently bringing the dentil 28 of the piston within the recess of the hammer, before these parts are placed within' the cylinder 2, a connection is formed which holds the hammer to have movement with the piston, but which at the same time permits alimited degree of flexibility of movement of the one member with respect to the other. The hammer 29 is made of sufficient longitudinal extent that when reciprocated to permit the operator to hold the tool properly positioned with one hand while operating the crank handle 10, and as the gear wheel 6 is of a greater dimension than the pinion 8, it will be seen that several blows are struck by the hammer to cause cutting impact of the tool with each turn of the crank handle.

The piiston 24 preferably has a more or less flui tight fit in the cylinder 2 and thus as the piston is moved toward the hammer block 17, air will be compressed within the chamber of'the cylinder above the hammer block and in the-use of the machine as a driving force for a rock drill, this air compressed in the cylinder can be used to very good advantage to blow the dust and cuttings from beneath the cutting edge 23 of the tool. The drill 19 has a longitudinally formed passage 33 extending through the length thereof and opening at the upper end of the shank 20, and the hammer block 17 has a passage34 formed centrally thereof in alinement with the passage 33 so'that as the piston 24 is moved on the down" stroke and air is compressed in the cylinder, this air is forced through the passages 34 and33 to be discharged in a cleaning blast at the ,L, cutting edge or point of the tool. An open 5 communicate with the piston chamber thereof and a check valve 36 is located in this opening to permit the supply of air to the piston chamber upon the up stroke of the piston.

With the use of the machine in setting rivets, it will be understood that the drill or tool 19 will be displaced by a tool having a recess or cupped end to give form to the rivethead as they blows are struck, and in this use it will not only not be necessary to use the air blast, but where the machine is used in hot riveting, the air blast would be detrimental, and inthis adaptation of the machine, the check valve 36 may be removed from the opening 35 and thus there will be no compression of air to be forced through the passage 34 of the hammer block 17.

\Vhile I have shown and described only one specific form of the invention, it will be understood that the socket of the bushing might be made circular in cross section or of any polygonal form to receive the shank of the tool to be used, that bushings having various forms of tool shank receiving openings might be provided, that a connection between the piston and the hammer might be accomplished in a varied manner, and that other changes might be resorted to without departing from the spirit and scope of my invention and hence I do not wish to be limited except to such points as the claims may set forth.

I claim:

1. A drilling machine comprising a cylinder, a bushing mounted in said cylinder at one end thereof and provided with an opening to receive and hold a cutting tool to permit endwisemovement thereof, a hammer mounted in said cylinder to be capable of reciprocatory movement to thus direct driving blows against the tool and said hammer recessed at the end away from the head.

rocatory movement in the cylinder and to thus impart this movement to the hammer.

2. A drilling machine comprising a eylinder, a bushing mounted in one end of said cylinder and provided with an opening to receive and hold a cutting tool to permit endwise sliding movement thereof, a hammer block mounted in the cylinder in bearing engagement with the inner end of the tool and arranged to be capable of limited reciproeatory movement, a-hammer mounted in the cylinder to be capable of reciprocatory movement into and out of engage-- ment with the hammer block to thus direct v ing 35 is provided through the cylinder 2 to driving blows against the tool and recessed at its end to provide a laterally extending dentil, a piston mounted in the cylinder recessed at that end adjacent to the hammer and provided with a laterally disposed dentil, said piston and hammer so formed that the (lentil of the one may be fitted in the recess of the other and the hammer will thus be mounted in conjunction with the piston to be positively carried therewith but to have a certain degree-oi; lo'st movement, and lneans by which the piston is moved to impart reciprocatory movement to the hammer.

3. A drilling machine comprising a cylin der, a bushing mounted in one end of said cylinder and provided with an opening to receive and hold a cutting tool to permit endwise sliding movement thereof, a hammer block monntedin the cylinder in hearing engagement with the inner end of the tool and arranged to be capable of limited reciprocator movement, a hammer mounted in the cylinder to-be capable of reciprocatory movement into and out of engagement with the hammer block to thus direct driving blows against the tool and recessed at its end to provide a laterally extending dentil, a piston mounted in the cylinder recessed at that end adjacent to the hammer and provided with a laterally disposeddentil, said piston and hammer so formed that the (lentil of the one may be fitted in the recess of the other and the hammer will thus be mounted in conjunction with thepistori to be positively carried therewith but to have a certain degree of lost movement, said tool and hammer block provided with registering passages extending into the cylinder, the

)iston being arran 'ed in a manner that on R I i its down stroke to bring the hammer against the hammer block it will'compress air w1thin the cylinder to be forced through the registering and alined passages to blow the cuttings'from the working end of the tool,

and a valved inlet passage to supply air to the cylinder.

all A drilling machine comprising a cylinder, a bushing mounted in one end of said cyhnder andprovided with an openlng to receive andhold a cutting tool to permit endwise sliding movement thereof, a 'hammer block mounted in the cylinder in hearng engagement with the inner end of the tool and arranged to be capable of llmlted reciprocatorymovement, a hammer mounted 1n the cylinder to be capable of reciprocatory movement into and out of engagement with the hammer block to thus dlrect drlvmg blows against the tool and recessed .at

its end to provide a laterally extending den- 0 til, a piston mounted in the cylinder re cessed at that end adjacent to the hammer and provided with a laterally. disposed dentil, said piston and hannner so formed that the dentil of the one may be fitted in the 55 recess of the other and the hammer will thus be mounted in conjunction with the iston to be positively carried therewith 'ut to have a. certain degree of lost movement,

a casing connected with that end of the m cylinder within which the piston works, an

eccentric mounted in said casing, a connect-- ing rod extending from the eccentric to the DENIS S'r. DnNIs, J. H. LAWRENCE. 

